Remote Plasma Treatment for Sige Etch Surface Roughness
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Solution Overview
Problem
Conventional etching processes struggle to uniformly recess silicon-and-germanium-containing materials due to residue formation, leading to increased surface roughness and adverse effects on electrical and mechanical properties in semiconductor devices.
Innovation Solution
A remote plasma system is used to generate plasma effluents from treatment precursors, which are flowed into a semiconductor processing chamber to remove residue from the silicon-and-germanium-containing material surfaces, improving surface roughness and enabling a more uniform etch process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional etching processes are used to recess silicon-and-germanium-containing material, then material removal is achieved, but surface roughness increases due to residue formation
Solution Approach 1:
The patent applies preliminary action by performing plasma treatment before the etching process to remove organic residue from the silicon-and-germanium-containing material surface. This pre-cleaning step ensures that subsequent etching occurs on a clean surface, preventing residue-related roughness and improving etch uniformity and precision.
2Reliability
If wet HF etching is used to remove material, then selective etching of silicon oxide is achieved, but penetration into constrained trenches is difficult and material deformation occurs
Solution Approach 1:
The patent replaces wet chemical etching with plasma-based etching processes. Plasma etching uses reactive species and physical bombardment to remove material, enabling effective penetration into high-aspect-ratio trenches and constrained geometries while maintaining selectivity through controlled chemistry and reducing deformation of delicate structures.
3Ease of operation
If dry plasma etching is used to etch material, then penetration into constrained trenches is improved and material deformation is reduced, but substrate damage occurs due to electric arcs
Solution Approach 1:
The patent applies parameter changes by carefully controlling plasma process parameters including power levels, pressure, gas composition, and temperature to optimize etching performance while minimizing substrate damage. By adjusting these parameters, the process achieves effective trench penetration while reducing the formation of electric arcs and associated substrate damage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively reduces the average surface roughness of etched silicon-and-germanium-containing materials, enhancing the uniformity and quality of semiconductor structures by removing residue and improving etching precision.
Implementation Method 1
A remote plasma system may be used to generate plasma effluents from a treatment precursor
Data Source
AI summary
Exemplary semiconductor processing methods may include providing a treatment precursor to a processing a remote plasma system of a semiconductor processing chamber. The methods may include generating plasma effluents of the treatment precursor in the remote plasma system. The methods may include flowing plasma effluents of the treatment precursor to a processing region of the semiconductor processing chamber. A substrate including alternating layers of material may be disposed within the processing region. The alternating layers of material may include a silicon-and-germanium-containing material. The methods may include contacting the substrate with the plasma effluents of the treatment precursor. The contacting may remove a residue from a surface of the silicon-and-germanium-containing material.